I think AP bridge will not make a transparent bridge, but try with ap-bridge and check whether the DHCP requests work or not?
I myself have some misunderstandings in Wireless modes http://forum.mikrotik.com/t/any-matrix-which-wireless-mode-can-work-together/51567/1
But I think the bridge should works well as L2 bridge
It is also useful http://wiki.mikrotik.com/wiki/Manual:Wireless_Station_Modes
in there
Mode station
This is standard mode that does not support L2 bridging on station - attempts to put wireless interface in bridge will not produce expected results. On the other hand this mode can be considered the most efficient and therefore should be used if L2 bridging on station is not necessary - as in case of routed or MPLS switched network. This mode is supported for all wireless protocols.
so you need to change the wlan1 to station wds
For wlan2, I’m not sure but let me take atour on wiki 